Minor clarifications in the documentation

README.md

@@ -9,7 +9,7 @@ of PRs, we will try to merge them when possible.
 
 # SymCC: efficient compiler-based symbolic execution
 
-SymCC is a compiler wrapper which embeds symbolic execution into the program
+SymCC is a compiler pass which embeds symbolic execution into the program
 during compilation, and an associated run-time support library. In essence, the
 compiler inserts code that computes symbolic expressions for each value in the
 program. The actual computation happens through calls to the support library at

docs/Configuration.txt

@@ -79,12 +79,15 @@ environment variables.
   repeatedly (QSYM backend only). See the QSYM paper for details; highly
   recommended for fuzzing and enabled automatically by the fuzzing helper.
 
-- SYMCC_AFL_COVERAGE_MAP (default empty): When set to the file name of an AFL
-  coverage map, load the map before executing the target program and use it to
-  skip solver queries for paths that have already been covered (QSYM backend
-  only). The map is updated in place, so beware of races when running multiple
-  instances of SymCC! The fuzzing helper uses this to remember the state of
-  exploration across multiple executions of the target program.
+- SYMCC_AFL_COVERAGE_MAP (default empty): When set to the file name of an
+  AFL-style coverage map, load the map before executing the target program and
+  use it to skip solver queries for paths that have already been covered (QSYM
+  backend only). The map is updated in place, so beware of races when running
+  multiple instances of SymCC! The fuzzing helper uses this to remember the
+  state of exploration across multiple executions of the target program.
+  Warning: This setting has a misleading name - while the format of the map
+  follows (classic) AFL, the variable isn't meant to point at a map file that
+  AFL uses too!
 
 (Most people should stop reading here.)