diff --git a/doc/files/files.html b/doc/files/files.html
index 12684cd9..10312650 100644
--- a/doc/files/files.html
+++ b/doc/files/files.html
@@ -453,7 +453,7 @@ app <em class="replaceable"><code>application</code></em> {
 							itself as signature terminal (ST).
 							We usually will use the reader's
 							capability to sign the data.
-							However, during developement you
+							However, during development you
 							may specify soft certificates and
 							keys for a ST.
 						</p><p>
diff --git a/doc/files/opensc.conf.5.xml.in b/doc/files/opensc.conf.5.xml.in
index f441a923..118922a8 100644
--- a/doc/files/opensc.conf.5.xml.in
+++ b/doc/files/opensc.conf.5.xml.in
@@ -672,7 +672,7 @@ app <replaceable>application</replaceable> {
 							itself as signature terminal (ST).
 							We usually will use the reader's
 							capability to sign the data.
-							However, during developement you
+							However, during development you
 							may specify soft certificates and
 							keys for a ST.
 						</para>
diff --git a/etc/opensc.conf.example.in b/etc/opensc.conf.example.in
index 161a71a6..43a9aec0 100644
--- a/etc/opensc.conf.example.in
+++ b/etc/opensc.conf.example.in
@@ -174,7 +174,7 @@ app default {
 		# QES is only possible with a Comfort Reader (CAT-K), which holds a
 		# cryptographic key to authenticate itself as signature terminal (ST).
 		# We usually will use the reader's capability to sign the data.
-		# However, during developement you may specify soft certificates and
+		# However, during develpement you may specify soft certificates and
 		# keys for a ST below.
 		# The following example EAC PKI can be found in vicc's example data:
 		# https://github.com/frankmorgner/vsmartcard/tree/master/virtualsmartcard/npa-example-data