diff --git a/build/jam/MiscRules b/build/jam/MiscRules
index 35885436a4..18109d184c 100644
--- a/build/jam/MiscRules
+++ b/build/jam/MiscRules
@@ -398,7 +398,13 @@ rule DefineBuildProfile name : type : path {
 
 	switch $(HAIKU_BUILD_PROFILE_ACTION) {
 		case "build" : {
-			JAM_TARGETS = $(buildTarget) ;
+			# If parameters are specified, only build those targets (under the
+			# influence of the build profile).
+			if $(HAIKU_BUILD_PROFILE_PARAMETERS) {
+				JAM_TARGETS = $(HAIKU_BUILD_PROFILE_PARAMETERS) ;
+			} else {
+				JAM_TARGETS = $(buildTarget) ;
+			}
 		}
 
 		case "update" : {
diff --git a/build/jam/UserBuildConfig.ReadMe b/build/jam/UserBuildConfig.ReadMe
index f57f0d1824..051150ce1e 100644
--- a/build/jam/UserBuildConfig.ReadMe
+++ b/build/jam/UserBuildConfig.ReadMe
@@ -242,6 +242,10 @@ switch $(HAIKU_BUILD_PROFILE) {
 #	-> Equivalent to running "jam -q haiku-image" with the settings for the
 #      "disk" profile. "build" is the default action, so it could even be
 #      omitted.
+# jam -q @alpha-raw build haiku.hpkg
+#	-> Build's haiku.hpkg under the influence of the "alpha-raw" profile. This
+#      is is different to "jam -q haiku.hpkg" in that the build profile may
+#      enable certain build features that might not be enabled by default.
 # jam -q @vmware update kernel
 #	-> Equivalent to running "jam -q update-vmware-image kernel" with the
 #      settings for the "vmware" profile.