More doc.

diff --git a/README.markdown b/README.markdown
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+This is an attempt to write an automated test suite for apitrace.
+
+It is still work in progress, and has a lot unfinished code/ideas.
+
+To run the test suite do
+
+    cmake -DAPITRACE_BINARY_DIR=/path/to/apitrace/build/ .
+    make
+    make test

diff --git a/README.md b/README.md
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-This is an attempt to write an automated test suite for apitrace.
-
-It is still work in progress, and has a lot unfinished code/ideas.
-
-To run the test suite do
-
-    cmake -DAPITRACE_BINARY_DIR=/path/to/apitrace/build/ .
-    make
-    make test

diff --git a/apps/gl/README.markdown b/apps/gl/README.markdown
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+OpenGL test applications.
+
+The applications here were adapted from open-source demos suites (such as Mesa
+demos suite), modified to be non-interactive.
+
+Rather than cover the full breadth of OpenGL functionality, the focus here is
+to cover entrypoints that require special hand-written code to be
+traced/retraced correctly.