5 files changed, 8 insertions, 4 deletions
diff --git a/doc/ScintillaDoc.html b/doc/ScintillaDoc.html
index 20a2925c6..21b110e34 100644
--- a/doc/ScintillaDoc.html
+++ b/doc/ScintillaDoc.html
@@ -5761,7 +5761,7 @@ sptr_t CallScintilla(unsigned int iMessage, uptr_t wParam, sptr_t lParam){
 <span class="S5">public</span><span class="S10">:</span><br />
 <span class="S0">&nbsp; &nbsp; &nbsp; &nbsp; </span><span class="S5">virtual</span><span class="S0"> </span><span class="S5">int</span><span class="S0"> </span>SCI_METHOD<span class="S0"> </span>Release<span class="S10">()</span><span class="S0"> </span><span class="S10">=</span><span class="S0"> </span><span class="S4">0</span><span class="S10">;</span><br />
 <span class="S0">&nbsp; &nbsp; &nbsp; &nbsp; </span><span class="S2">// Returns a status code from SC_STATUS_*</span><br />
-<span class="S0">&nbsp; &nbsp; &nbsp; &nbsp; </span><span class="S5">virtual</span><span class="S0"> </span><span class="S5">int</span><span class="S0"> </span>SCI_METHOD<span class="S0"> </span>AddData<span class="S10">(</span><span class="S5">char</span><span class="S0"> </span><span class="S10">*</span>data<span class="S10">,</span><span class="S0"> </span><span class="S5">int</span><span class="S0"> </span>length<span class="S10">)</span><span class="S0"> </span><span class="S10">=</span><span class="S0"> </span><span class="S4">0</span><span class="S10">;</span><br />
+<span class="S0">&nbsp; &nbsp; &nbsp; &nbsp; </span><span class="S5">virtual</span><span class="S0"> </span><span class="S5">int</span><span class="S0"> </span>SCI_METHOD<span class="S0"> </span>AddData<span class="S10">(</span><span class="S5">const</span><span class="S0"> </span><span class="S5">char</span><span class="S0"> </span><span class="S10">*</span>data<span class="S10">,</span><span class="S0"> </span>Sci_Position<span class="S0"> </span>length<span class="S10">)</span><span class="S0"> </span><span class="S10">=</span><span class="S0"> </span><span class="S4">0</span><span class="S10">;</span><br />
 <span class="S0">&nbsp; &nbsp; &nbsp; &nbsp; </span><span class="S5">virtual</span><span class="S0"> </span><span class="S5">void</span><span class="S0"> </span><span class="S10">*</span><span class="S0"> </span>SCI_METHOD<span class="S0"> </span>ConvertToDocument<span class="S10">()</span><span class="S0"> </span><span class="S10">=</span><span class="S0"> </span><span class="S4">0</span><span class="S10">;</span><br />
 <span class="S10">};</span><br />
 </div>
diff --git a/doc/ScintillaHistory.html b/doc/ScintillaHistory.html
index 6053fed1e..0cf3d09cb 100644
--- a/doc/ScintillaHistory.html
+++ b/doc/ScintillaHistory.html
@@ -542,6 +542,10 @@
 	An SCN_AUTOCSELECTIONCHANGE notification is sent when items are highlighted in an autocompletion or user list.
 	</li>
 	<li>
+	The data parameter to ILoader::AddData made const.
+	<a href="http://sourceforge.net/p/scintilla/bugs/1955/">Bug #1955</a>.
+	</li>
+	<li>
 	SciTE's embedded Lua interpreter updated to Lua 5.3.
 	</li>
 	<li>
diff --git a/include/ILexer.h b/include/ILexer.h
index 5680acb4e..d18b307d1 100644
--- a/include/ILexer.h
+++ b/include/ILexer.h
@@ -85,7 +85,7 @@ class ILoader {
 public:
 	virtual int SCI_METHOD Release() = 0;
 	// Returns a status code from SC_STATUS_*
-	virtual int SCI_METHOD AddData(char *data, Sci_Position length) = 0;
+	virtual int SCI_METHOD AddData(const char *data, Sci_Position length) = 0;
 	virtual void * SCI_METHOD ConvertToDocument() = 0;
 };
 
diff --git a/src/Document.cxx b/src/Document.cxx
index 209060e5e..98baf9180 100644
--- a/src/Document.cxx
+++ b/src/Document.cxx
@@ -1138,7 +1138,7 @@ void Document::ChangeInsertion(const char *s, Sci::Position length) {
 	insertion.assign(s, length);
 }
 
-int SCI_METHOD Document::AddData(char *data, Sci_Position length) {
+int SCI_METHOD Document::AddData(const char *data, Sci_Position length) {
 	try {
 		Sci::Position position = static_cast<Sci::Position>(Length());
 		InsertString(position, data, static_cast<Sci::Position>(length));
diff --git a/src/Document.h b/src/Document.h
index 520755ae3..bf44b6c3b 100644
--- a/src/Document.h
+++ b/src/Document.h
@@ -316,7 +316,7 @@ public:
 	bool DeleteChars(Sci::Position pos, Sci::Position len);
 	Sci::Position InsertString(Sci::Position position, const char *s, Sci::Position insertLength);
 	void ChangeInsertion(const char *s, Sci::Position length);
-	int SCI_METHOD AddData(char *data, Sci_Position length);
+	int SCI_METHOD AddData(const char *data, Sci_Position length);
 	void * SCI_METHOD ConvertToDocument();
 	Sci::Position Undo();
 	Sci::Position Redo();