diff --git a/Docs/src/compiler.but b/Docs/src/compiler.but
index 9d00cc4b..a4fb4311 100644
--- a/Docs/src/compiler.but
+++ b/Docs/src/compiler.but
@@ -33,6 +33,19 @@ Causes the NSIS compiler to scan the given directory for plug-in DLLs.
 \c !addplugindir myplugin
 \c MyPlugin::SomeFunction
 
+\S1{appendfile} !appendfile
+
+\c file text
+
+Appends \e{text} to \e{file}.
+
+\c !tempfile FILE
+\c !appendfile "${FILE}" "XPStyle on$\n"
+\c !appendfile "${FILE}" "Name 'test'$\n"
+\c !include "${FILE}"
+\c !delfile "${FILE}"
+\c !undef FILE
+
 \S1{cd} !cd
 
 \c new_path
diff --git a/Source/script.cpp b/Source/script.cpp
index fcd18aa7..25f8773e 100644
--- a/Source/script.cpp
+++ b/Source/script.cpp
@@ -1069,6 +1069,30 @@ int CEXEBuild::doCommand(int which_token, LineParser &line)
       SCRIPT_MSG("!delfile: \"%s\"\n", line.gettoken_str(1));
     return PS_OK;
 
+    case TOK_P_APPENDFILE:
+      {
+        char *file = line.gettoken_str(1);
+        char *text = line.gettoken_str(2);
+
+        FILE *fp = FOPEN(file, "a");
+        if (!fp)
+        {
+          ERROR_MSG("!appendfile: \"%s\" couldn't be opened.\n", file);
+          return PS_ERROR;
+        }
+
+        if (fputs(text, fp) < 0)
+        {
+          ERROR_MSG("!appendfile: error writing to \"%s\".\n", file);
+          return PS_ERROR;
+        }
+
+        fclose(fp);
+
+        SCRIPT_MSG("!appendfile: \"%s\" \"%s\"\n", file, text);
+      }
+    return PS_OK;
+
     // page ordering shit
     ///////////////////////////////////////////////////////////////////////////////
 #ifdef NSIS_CONFIG_VISIBLE_SUPPORT
diff --git a/Source/tokens.cpp b/Source/tokens.cpp
index 02a64049..c837925a 100644
--- a/Source/tokens.cpp
+++ b/Source/tokens.cpp
@@ -244,6 +244,7 @@ static tokenType tokenlist[TOK__LAST] =
 
 {TOK_P_TEMPFILE,"!tempfile",1,0,"symbol",TP_ALL},
 {TOK_P_DELFILE,"!delfile",1,0,"file",TP_ALL},
+{TOK_P_APPENDFILE,"!appendfile",2,0,"file appended_line",TP_ALL},
 
 {TOK_MISCBUTTONTEXT,"MiscButtonText",0,4,"[back button text] [next button text] [cancel button text] [close button text]",TP_GLOBAL},
 {TOK_DETAILSBUTTONTEXT,"DetailsButtonText",0,1,"[details button text]",TP_PG},
diff --git a/Source/tokens.h b/Source/tokens.h
index 9ec243f6..0919babd 100644
--- a/Source/tokens.h
+++ b/Source/tokens.h
@@ -97,6 +97,7 @@ enum
 
   TOK_P_TEMPFILE,
   TOK_P_DELFILE,
+  TOK_P_APPENDFILE,
 
   // section/function shit
   TOK_SECTION,