diff --git a/README.md b/README.md
index fc6a909..88b02c8 100644
--- a/README.md
+++ b/README.md
@@ -35,13 +35,13 @@ The default enabled libraries included in the `ffmpeg` build are:
 - libmp3lame
 
 The user-overridable compile options are:
-- `CLEAN`: clean build directories before building
-- `LTO`: enable link time optimization
-- `OPT`: optimization level (0-3)
-- `STATIC`: static or shared build
-- `ARCH`: architecture type (x86-64-v{1,2,3,4}, armv8-a, etc)
-- `PREFIX`: prefix to install to, default is local install in ./gitignore/sysroot
-- `ENABLE`: configure what ffmpeg enables
+- `CLEAN`: clean build directories before building (default: ON)
+- `LTO`: enable link time optimization (default: ON)
+- `OPT`: optimization level (0-3) (default: 3)
+- `STATIC`: static or shared build (default: ON)
+- `ARCH`: architecture type (x86-64-v{1,2,3,4}, armv8-a, etc) (default: native)
+- `PREFIX`: prefix to install to, default is local install in ./gitignore/sysroot (default: local)
+- `ENABLE`: configure what ffmpeg enables (default: libsvtav1_psy libopus libdav1d libaom librav1e libvmaf libx264 libx265 libwebp libmp3lame)
 
 Examples:
 - only build libsvtav1_psy and libopus: `ENABLE='libsvtav1_psy libopus' ./scripts/build.sh`
diff --git a/lib/build.sh b/lib/build.sh
index f952ac9..5762e4e 100644
--- a/lib/build.sh
+++ b/lib/build.sh
@@ -314,7 +314,7 @@ download_release() {
 	done
 
 	# enabling a clean build
-	if [[ ${CLEAN} == true ]]; then
+	if [[ ${CLEAN} == 'ON' ]]; then
 		DO_CLEAN="rm -rf"
 	else
 		DO_CLEAN='void'
@@ -734,7 +734,7 @@ build_libplacebo() {
 	(
 		installDir="${PWD}/3rdparty/glad"
 		get_build_conf glad
-		CLEAN=false download_release
+		CLEAN=OFF download_release
 		cd "${extractedDir}" || exit 1
 		cp -r ./* "${installDir}"
 	) || return 1
diff --git a/lib/compile_opts.sh b/lib/compile_opts.sh
index 3eb0580..517d1b5 100644
--- a/lib/compile_opts.sh
+++ b/lib/compile_opts.sh
@@ -9,7 +9,7 @@ declare -Ag FB_COMP_OPTS_DESC
 
 # default compile options
 FB_COMP_OPTS_DESC['CLEAN']='clean build directories before building'
-DEFAULT_CLEAN=true
+DEFAULT_CLEAN=ON
 
 FB_COMP_OPTS_DESC['LTO']='enable link time optimization'
 DEFAULT_LTO=ON
@@ -37,7 +37,7 @@ libvmaf \
 libx264 \
 libx265 \
 libwebp \
-libmp3lame \
+libmp3lame\
 "
 
 # user-overridable compile option variable names
diff --git a/lib/readme.sh b/lib/readme.sh
index 5ea965e..e63e6f1 100644
--- a/lib/readme.sh
+++ b/lib/readme.sh
@@ -13,7 +13,8 @@ gen_function_info() {
 
 gen_compile_opts_info() {
 	for opt in "${FB_COMP_OPTS[@]}"; do
-		echo "- \`${opt}\`: ${FB_COMP_OPTS_DESC[${opt}]}"
+		declare -n defOptVal="DEFAULT_${opt}"
+		echo "- \`${opt}\`: ${FB_COMP_OPTS_DESC[${opt}]} (default: ${defOptVal})"
 	done
 }