diff --git a/src/_h5ai/config.js b/src/_h5ai/config.js
index 61cba1a4..92710955 100644
--- a/src/_h5ai/config.js
+++ b/src/_h5ai/config.js
@@ -193,6 +193,7 @@ var H5AI_CONFIG = {
 				"c": "c",
 				"cpp": "cpp",
 				"css": "css",
+				"diff": "diff",
 				"h": "c",
 				"hpp": "cpp",
 				"install": "plain",
@@ -302,6 +303,7 @@ var H5AI_CONFIG = {
 		"css":				[".css", ".less"],
 		"deb":				[".deb"],
 		"default":			[],
+		"diff":				[".diff", ".patch"],
 		"doc":				[".doc", ".docx", ".odm", ".odt", ".ott"],
 		"draw":				[".drw"],
 		"eps":				[".eps"],
@@ -345,7 +347,7 @@ var H5AI_CONFIG = {
 		"sql":				[],
 		"tar":				[".tar"],
 		"tex":				[".tex"],
-		"text":				[".diff", ".patch", ".text", ".txt"],
+		"text":				[".text", ".txt"],
 		"tiff":				[".tiff"],
 		"unknown":			[],
 		"vcal":				[".vcal"],
diff --git a/src/_h5ai/icons/16x16/diff.png b/src/_h5ai/icons/16x16/diff.png
new file mode 100644
index 00000000..5bef9207
Binary files /dev/null and b/src/_h5ai/icons/16x16/diff.png differ
diff --git a/src/_h5ai/icons/48x48/diff.png b/src/_h5ai/icons/48x48/diff.png
new file mode 100644
index 00000000..c7bf4344
Binary files /dev/null and b/src/_h5ai/icons/48x48/diff.png differ