diff --git a/README.md b/README.md
index 198c7cf..ac3655a 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 This tool generates vanity ed25519 ([hidden service version 3][v3],
 formely known as proposal 224) onion addresses.
 
-### Requirements
+### Requirements for building
 
 * C99 compatible compiler (gcc and clang should work)
 * libsodium (including headers)
@@ -20,23 +20,26 @@ apt install gcc libc6-dev libsodium-dev make autoconf
 
 ### Building
 
-`./autogen.sh` to generate configure script, if it's not there already.
+Run `./autogen.sh` to generate a configure script, if there isn't one already.
 
-`./configure` to generate makefile; in \*BSD platforms you probably want to use
+Run `./configure` to generate a makefile.
+On \*BSD platforms you may need to specify extra include/library paths:
 `./configure CPPFLAGS="-I/usr/local/include" LDFLAGS="-L/usr/local/lib"`.
 
 On AMD64 platforms, you probably also want to pass something like
-`--enable-amd64-51-30k`  to configure script for faster key generation;
+`--enable-amd64-51-30k` to the configure script invocation for faster key generation;
 run `./configure --help` to see all available options.
 
 Finally, `make` to start building (`gmake` in \*BSD platforms).
 
 ### Usage
 
-Generator needs one or more filters to work.
+mkp224o needs one or more filters to work.
+You may specify them as command line arguments,
+eg `./mkp224o test`, or load them from file with `-f` switch.
 
-It makes directory with secret/public keys and hostname
-for each discovered service. By default root is current
+It makes directories with secret/public keys and hostnames
+for each discovered service. By default, the working directory is the current
 directory, but that can be overridden with `-d` switch.
 
 Use `-s` switch to enable printing of statistics, which may be useful
diff --git a/ed25519/amd64-51-30k/consts.S b/ed25519/amd64-51-30k/consts.S
index b2ca1ab..5713447 100644
--- a/ed25519/amd64-51-30k/consts.S
+++ b/ed25519/amd64-51-30k/consts.S
@@ -1,4 +1,8 @@
+#ifndef __APPLE__
 .section .rodata
+#else
+.const
+#endif
 
 .globl CRYPTO_NAMESPACE(batch_REDMASK51)
 .globl CRYPTO_NAMESPACE(batch_121666_213)
diff --git a/ed25519/amd64-64-24k/consts.S b/ed25519/amd64-64-24k/consts.S
index ca9896f..db6bad5 100644
--- a/ed25519/amd64-64-24k/consts.S
+++ b/ed25519/amd64-64-24k/consts.S
@@ -1,4 +1,8 @@
+#ifndef __APPLE__
 .section .rodata
+#else
+.const
+#endif
 
 .globl CRYPTO_NAMESPACE(121666)
 .globl CRYPTO_NAMESPACE(MU0)
diff --git a/main.c b/main.c
index b244519..b4e447f 100644
--- a/main.c
+++ b/main.c
@@ -223,7 +223,7 @@ static void savecheckpoint(void)
 
 	if (syncwrite(checkpointfile,1,checkpoint,SEED_LEN) < 0) {
 		pthread_mutex_lock(&fout_mutex);
-		fprintf(stderr,"ERROR: could not save checkpoint\n");
+		fprintf(stderr,"ERROR: could not save checkpoint to \"%s\"\n",checkpointfile);
 		pthread_mutex_unlock(&fout_mutex);
 	}
 }
diff --git a/worker.c b/worker.c
index 2db6ab8..9958be2 100644
--- a/worker.c
+++ b/worker.c
@@ -103,7 +103,7 @@ static void onionready(char *sname,const u8 *secret,const u8 *pubonion)
 	if (!yamloutput) {
 		if (createdir(sname,1) != 0) {
 			pthread_mutex_lock(&fout_mutex);
-			fprintf(stderr,"ERROR: could not create directory for key output\n");
+			fprintf(stderr,"ERROR: could not create directory \"%s\" for key output\n",sname);
 			pthread_mutex_unlock(&fout_mutex);
 			return;
 		}
diff --git a/yaml.c b/yaml.c
index c8778a6..56bd10e 100644
--- a/yaml.c
+++ b/yaml.c
@@ -274,7 +274,7 @@ int yamlin_parseandcreate(
 			sigprocmask(SIG_BLOCK,&nset,&oset);
 #endif
 			if (createdir(sname,1) != 0) {
-				fprintf(stderr,"ERROR: could not create directory for key output\n");
+				fprintf(stderr,"ERROR: could not create directory \"%s\" for key output\n",sname);
 				return 1;
 			}